Supporting means for rock drills



Dec. M5, i924. 1,51%,981

c.MoTT

SUPPORTING MEANS FOR ROCK DRILLS Filed July 1, 1920 Patented Dec. 16,1924.

pairs-o STATES TATENT OFFTCE.

CHESTER MOTT, OF DENVER, COLORADO, ASSIGNOR TO SULLIVAN MACHINERY COM-PANY, A CORPORATION OF MASSACHUSETTS.

SUPPORTING MEANS FOR ROCK DRILLS.

Application filed July 1,

To all whom z't may concern:

Be it known that I, CHESTER Mo'rT, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Supporting Means forRock Drills, of which the following is a full, clear, and exactspecification.

My invention relates to supporting means for rock drills, and moreparticularly to guiding and supporting means for rock drills of the typeknown as stopers.

The object of my invention is to provide an improved attachable supportfor use in connection with stoping drills. A further object of myinvention is to provide an improved support which may be readilyattached and detached from a stoping drill of stock commercial ,form,and which will permit the use of the normal feed of such drills to themaximum limit. A further object of my invention is to provide animproved support for sto-ping drills which, when attached to the feedcylinders thereof, will support the drills in such a manner as almostentirely to avoid the usual difliculties experienced, due to side stressand binding of the feed piston rod when the drill is at. the forward endof its feed and the cramping of the-drill steel in the hole.Furtherobjects of my invention will appear in the course of the.accompanying specification.

In the accompanying drawings I have shown for purposes of illustration,one form which my invention may assume in practice.

In these drawings,-

Fig. 1 is a. side elevation of a stoping drill provided with a forin ofsupport which I have selected for disclosure as an illustrativeembodiment of my invention, certain portions of the feed mechanism ofthe drill and of my improved support being shown broken away toillustrate details of construction.

Fig. 2 is a transverse section on the line 22 of Fig. 1.

In the illustrative embodiment of my invention I have shown my improvedsupport mechanism used in connection with a' stoping drill of familiarcommercial con struction. -As is well known to those 1920. Serial No.393,470.

versed in this art, these drills comprise a motor herein designated by1, to the rear end of which is secured a piston rod 2 which is actuatedby a piston 3 located in a feed cylinder 4:, the feed of the drill beingcontrolled by a throttle valve 5, and by a brake of familiarconstruction 6. Suitable automatic steel rotation is provided.

When working at a considerable angle in a stope, it has been found thatwhen the drill is fed forward toward the maximum limit of its feedingmovement, the weight of the parts puts a great side stress-upon thebearing for the piston rod in the front end of the feed cylinder, andthat the leverage of the parts about this bearing as a fulcrum causesthe piston to tend to bind very tightly against the interior wall of thefeed cylinder, if due to wear of the parts, sufficient play of thepiston rod in its bearing is present to permit this to occur. It alsocauses the cramping of the drill steel in the hole. In order to avoidthese disadvantages I have provided for attachment to the ordinarystoping drill, a sup ort mechanism which I have generally indicated by10 in the accompanying drawings. This support is mounted at its rear endby means of a suitable split clamp 11 and bolt 12 upon the exterior ofthe feed cylinder 4. Extending forwardly in parallelism. to the axis ofthe feed cylinder and drill, and laterally displaced by a smalldistance, is a member 13 which, at its forward end, is provided withaguide/portion illustrated in Fig. 2, designated as 14. This guide is soconstructed as to provide a sliding fit as at 15 ,for a portion of theperiphery of the cylinder of the drill 1. To provide a proper supportfor the front end of the member 13 and prevent its function beingdestroyed by bending about its point of clamping to the cylinder 4, Iprovide a longitudinal bore 18 in which an extension guide rod 19, shownas at 21, is slidable with a spring 20 behind the same to cause it to beextended.

The operation of my improved device will be evident from an inspectionof Fig. 1. When it is desired to employ my support, it is clamped inposition on the feed cylinder, and just to one side of and below theposition where it is desired to drill the .reception of the guidingpoint 21.

intended hole, a short socket is spotted in and drilled out for an inchor two for 1t lie 1e lower end of the feed cylinder being sup ported ona suitable rest, here shown as 23, and the upper end of the guide memberbeing supported as-shown 'at 24 in the hole just described, the drill 1may be fed forward and will slide in the guide 14;, being guided therebyand supported in alinement with the'axis of the feed cylinder. It willbe obvious that even though the drill may be fed out to substantiallythe end of its feed, the cylinder thereof Will still be guided by thesupport member 14, and tendency to- Ward binding of the rod 2 in thebearingthereof at the front end-of the feed cylinder .4 and of thepiston in the cylinder will be entirely prevented.

From the foregoing description, it will be obvious that I have provideda simple and readily attachable mechanism for use with stoping drills ofstandard construction, whereby the motor thereof may be supported anddifficulties in operation dueto binding of the feed piston rod may beavoided.

' It will also be noted that this mechanism relieves the runner of thenecessary holding of the drill during the starting of a hole, the weightbeing considerable in a tool of this type.

While I have in this application specificially described 'one form whichmy invention may assume in practice, it will be understood that thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodied in other forms without departingfrom'its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. The combination with a drilling apparatus comprising a drillactuating motor and feeding means therefor comprising a cylinder andpiston, of a guiding member secured to one of said last mentionedelements and having a guide parallel to the line of motion of said motorand by which said motor is guided, and extensible means adjacent thefree end of said member to support the same in a hole in the face whichis to be drilled.

2. The combination with a drilling apparatus comprising a drillactuating motor and feeding means therefor for comprising a cylinder andpiston, of a guiding member secured to one of said last mentionedelements and having a guide parallel to the line of motion of said motorand by which said motor is guided, and automatically extensible meansadjacent the free end of said member to support the same in a hole inthe face which is to be drilled.

3. For use in combination with a drilling apparatus comprising a toolactuating motor and feedingmeans therefor comprising,

a cylinder and piston, supporting and guiding means for said motorcomprising a guiding member, a member extending therefronrlongitudinally of and parallel to said feeding means and adapted toclamp one of the elements of the latter, a member telescopicallyarranged with respect to said last named member and adapted to engage ahole in the working face, and means between said members to normallyextend them.

In testimony whereof I aifix my signature.

CHESTER MOTT.

